Okay, the user wants me to translate "purely mechanical" into Simplified Chinese. Let me check the rules again. The first rule says to translate all content into Simplified Chinese. The second rule states that if the content is already in Simplified Chinese, output it unchanged. The third rule is to provide only the translation result with no explanations.
So, the input here is "purely mechanical". Since it's in English, I need to translate it. The correct translation for "purely mechanical" would be "纯粹机械的". I should make sure there's no explanation, just the translation. Let me confirm that there's no existing Simplified Chinese text here. The user provided an English phrase, so translating it is necessary. No need to leave it as is. Alright, the response should be just "纯粹机械的".